Season the chuck roast with salt and pepper.
Heat a large skillet over medium-high heat and sear the roast on all sides.
Place the seared roast in a slow cooker.
Sprinkle the ranch dressing mix and au jus gravy mix over the roast.
Pour in the beef broth and add the pepperoncini peppers.
Add the chopped carrots and cubed potatoes around the roast.
Cover and cook on low for 8 hours or high for 4 hours.
Once cooked, shred the beef with two forks.
Serve the roast with the vegetables and gravy.